Several royal titles have already shifted following the death of Queen Elizabeth II, including those of Archie and Lilibet Mountbatten-Windsor.
The two children of Prince Harry and Meghan, the Duchess of Sussex are now eligible to claim the titles of “prince” and “princess,” in keeping with a decree issued by King George V in 1917.
Although questions remain as to whether the titles will be changing: While the website of the royal family has been updated to reflect other royal family members' new titles, Archie and Lilibet are still listed as Master and Miss Mountbatten-Windsor.
According to that written order, known as Letters Patent, "the children and grandchildren of a reigning monarch have the automatic right to the title 'His Royal Highness' or 'Her Royal Highness' and 'prince' or 'princess,'" royal commentator and biographer Carolyn Durand told TODAY.
Before the queen's death on Sept. 8, Archie, 3, and Lilibet, 1, were great-grandchildren of the ruling monarch, and were thus not eligible to style their names with “prince” or “princess” titles, Durand explained.
But now, with their grandfather ruling as King Charles III, they would be eligible to use these honorifics.